1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2021,2023 The FreeBSD Foundation
5 *
6 * This software was developed by Björn Zeeb under sponsorship from
7 * the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #ifndef _LINUXKPI_LINUX_UUID_H
32 #define _LINUXKPI_LINUX_UUID_H
33
34 #include <linux/random.h>
35
36 #define UUID_STRING_LEN 36
37
38 #define GUID_INIT(x0_3, x4_5, x6_7, x8, x9, x10, x11, x12, x13, x14, x15) \
39 ((guid_t) { .x = { \
40 [0] = (x0_3) & 0xff, \
41 [1] = ((x0_3) >> 8) & 0xff, \
42 [2] = ((x0_3) >> 16) & 0xff, \
43 [3] = ((x0_3) >> 24) & 0xff, \
44 [4] = (x4_5) & 0xff, \
45 [5] = ((x4_5) >> 8) & 0xff, \
46 [6] = (x6_7) & 0xff, \
47 [7] = ((x6_7) >> 8) & 0xff, \
48 [8] = (x8), \
49 [9] = (x9), \
50 [10] = (x10), \
51 [11] = (x11), \
52 [12] = (x12), \
53 [13] = (x13), \
54 [14] = (x14), \
55 [15] = (x15) \
56 }})
57
58 typedef struct {
59 char x[16];
60 } guid_t;
61
62 static inline void
guid_gen(guid_t * g)63 guid_gen(guid_t *g)
64 {
65
66 get_random_bytes(g, 16);
67 g->x[7] = (g->x[7] & 0x0f) | 0x40;
68 g->x[8] = (g->x[8] & 0x3f) | 0x80;
69 }
70
71 static inline void
guid_copy(guid_t * dst,const guid_t * src)72 guid_copy(guid_t *dst, const guid_t *src)
73 {
74 memcpy(dst, src, sizeof(*dst));
75 }
76
77 #endif /* _LINUXKPI_LINUX_UUID_H */
78